Transmission-gear.



W. R. DUNKEL.

TRANSMISSION GEAR.

APPLICATION FILED SEPT.-l4, 1909.

921,522, Patented May 11, 1909.

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. L WILBER, R. D'UNKEL,

OF PANA, ILLINOIS.

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no. on 1,522.

Application filed September To all whom it may concern:

Ee it known that l, WiLBER R. DUNKEL, a

citizen of the UnitedStates, residing at Pana.

in the county of Christian and State of Illi-- nois, have invented a new and useful Trans-- missionGear, of which the following is a specification.

My invention relates to transmission gears, and its object is to provide an improved form of such gear wherein it will be possible to key to a shaft any' one of a series of gears while the shaft is rotating, in a positive manner and without danger of having two or more gears connected to the shaft at the same time,

in thedrawingsf-higure 1 is a section, through the transmission box of a motor car showing the application oi my device. Fig.

. 2 is a partial cut away view of my shaft.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

My invention consists broadly of a series of ears mounted on a hollow shaft, said'hollow halt being provided with means contained nerein to key any one of said gears to the in the term of my device that l have here shown, the casing l is provided to hold the gears. Through boxes 2 on said casing extends a hollow'shait At l is a clutch which may he of an desired form. The shaft 8 is provided with a slot 5 extending approximately for nearly the length of that of the shaft contained within the casing f.. A hollow plunger 6 having a slot '7 is held 0 move in said hollow shaft in such manner slots are in alinement. @n the shaft 3 are mounted gears 8, 9 and 10, in this instance the gear 8 being the high speed ear, gear 9 heing the low speed gear, an the gear 10 the hacking or reverse gear. in boxes ll in the same casing is mounted a shaft 12 forming the main driving shaft and videdwith suitable couplings or universal joints as at 13. Upon the shaft 12 are keyed 4 l5 and 16, and as is shown, the gear s gear 8 and the gear 15 meshes ear 9. Between gears 10 and 16, however; is interposed an idler 17 carried hya suitaole pin or bolt 18. This idler is in mesh tn hoth gears it: and 16 and reverses the tion in the usual manner. in the gears 8, F) e .d 10 are formed key'waysl which I prererahly make so that their longitudinal section will he the segment of a circle, the

Specification of Letters Patent.

hei ht 05 the are being relatively one-third or Patented May 11, 1909. 1908. Serial No. 53,903.

thereallout of the radius. make these key form.

llithin the hollow shaft, and projecting through the slot 17 is a key 20 in the form of a disk or roller; This key is normally pressed outward hy the action of a spring 2]. held in said plunger, and is of such size that in no instance will the outer edge come within the hollow portion of the shaft, but will continuously remain projecting into or through the slot 5, thus insuring the alinement oithe two slots hereinheiore mentioned. At 22 is provided a ball and socket joint or other means to permit the free rotation of the plunger 6, and connected to this joint is a suitable lever 23 to cause theplunger 6 to move longitudinally in said hollow shaft.

From an inspection of my drawing it will be seen that as there shown, the gear 8 is keyed to the shaft 3 and upon rotation of the latter, will move therewith and actuate the shaft 12 through the gear is. N ow, if it he desired to cause one of the other gears to actuatethe shaft 14 through its mate, it is simply necessary to move the plunger 6 outwardly, The form of key way in gear 8 will then force the key 20 down into the hollow of the plunger, thus freeing all of the gears and giving them free rotation on the shaft. As the plunger is drawn still further along, the key 20 comes opposite the key way in the next gear, and although this key way may not he at that moment in alinement with the slot in the shaft, just as soon as the shaft revolves far enough to bring said key way into alinernent with said slot, the key will be forced outwardly and lock the gear to the shaft, thus causing rotation ofshaft 12 through the new gear. it is obvious that the plunger may he moved in either direction from this point and cause any gear to key with the shaft.

l have here shown both shaft and plunger as having the hollow portion therein circular in cross section, hutit is obvious that any other cross section might he used, as for in stance, it might be desirable to merely slot a portion of the plunger sufficient to receive the spring and key. l do not, therefore, desire to confine myself to the exact form herein shown, but wish to include all such as properly come within the scope of my invention. it will he noted that there is also illustrated in the drawing a differential gear 24 of the ordinary type, the same being in- I may, however, ways of any other desired bly mounted on said shaft 0 posite said slot, Y

troduced between thesec'tions or members of l in, which the drive shaft, and having its drum encircled ger slidably mounted by the gears 14,15 and 16.

l. in a transmission gear, a having a slot therein, a series of gears rotatain the shaft, and proin the shaft, a disk carried by the plunger, hollow shaft 1 and a resilient means carried by the hunger adapted to project the disk through t e slots in the plunger and the shaft, and into engagement With one of the key-ways of the gears.

In testimony my own, I have hereto afiixed my signature in the presence of two Witnesses.

' WILBER R. DUNKEL.

and each having a key-Way iormed therein, a plan er slidablynlounted in said shaft, a disk plunger, and resilient disk through with the keyloose y carried by said means adapted to project said said slot and into engagement Way in one of said gears. f

2. In a transmission gear," a hollow shaft l Witnesses:

W. W; Monnrson, JonNl/V. Arnrson.

provided with a slot, a series of gears rotatably mounted upon said shaft opposite said slot and each having a key-Wayformed therevided with a slot,in alinement with the slot is concaved longitudinally, a plain-- that I claim the foregoing as 

